linux-kernel - Re: [PATCH] pinctrl: Support pin that does not support configuration option

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Message-ID: <CAOf5uwmSR1MjGdFd2ShHWchrdL6Kxo1HJOys9JoVP1vCDX57Lw@mail.gmail.com>
Date:   Mon, 1 Feb 2021 12:53:53 +0100
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Dong Aisheng <aisheng.dong@....com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Angelo Compagnucci <angelo@...rulasolutions.com>
Subject: Re: [PATCH] pinctrl: Support pin that does not support configuration option

Hi Fabio

On Mon, Feb 1, 2021 at 12:47 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Michael,
>
> On Sat, Jan 30, 2021 at 5:21 AM Michael Trimarchi
> <michael@...rulasolutions.com> wrote:
> >
> > Some of the iMX25 pins have not an associated configuration register so
> > when they are configured the standard way through the device tree the
> > kernel complains with:
> >
> > imx25-pinctrl 43fac000.iomuxc: Pin(MX25_PAD_EXT_ARMCLK) does not support
> > config function
>
> Could you please share your device tree that causes this warning?
>
> Shouldn't you pass 0x80000000 in the devicetree for this pad then?
>
> 0x80000000 means that the kernel should not touch the PAD_CTL register
> and use the default configuration from the bootloader/POR.

arch/arm/boot/dts/imx25-lisa.dts:
MX25_PAD_EXT_ARMCLK__GPIO_3_15  0x80000000

The problem that exists pad that can be muxed but not configured

Michael


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